Improvement in wrenches



B. .G MARTm Wrenches.- y

N0,1545, 355, Patented 001.727,1374.

Figi;

Wirt n esses:

PATENT OFFICEo BENJAMIN G. MARTIN, OF NEW YORK, N. Y.

IMPROVEMENT IN WRENHES.

Specification forming part of Letters Patent No. 156,365, dated October 27, 1874; application led April 6, 1874.

To all whom it may concern:

Beit known that I, BENJAMIN G. MARTIN, of the city, county, and State of New York, have invented a new and useful Improvement in Wrenches; and I do hereby declare thefollowing to be a full, clear, and exactdescription thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which draw- Ateeth cut in the shank of the stationary jaw in such a manner thatby turning the lockingsleeve in one direction, the stop-pawl is thrown back from the pinion, and the movable jaw canbe adjusted to suit the article to be acted upon, and by turning the locking-sleeve in the opposite direction, the stop-pawl is thrown in gear with the pinion and the movable jaw is'locked securely in the desired position.

In the drawing, the letter A designates the stationary jaw of my wrench, from which eX- tends the shank B, a portion of which is flat, and forms the guide for the movable jaw C, while another portion is round, and forms the guide for a sleeve, D. In'one edge of the flat portion 4of said shank `are provided teeth a, which engage with a pinion, b, mounted on a pin, c, that is secured in the back of the movable jaw. O11 the sleeve D is formed a double cam, d e, which engages with and acts upon t the shank of a stop-pawl E that swings on a pivot, f, secured in the back of the movable jaw. l/Vhen the sleeve is turned in one direction, the cam d forces the shank of the stoppawl back 'to the position shown in Figs. l and 2, and-the pawl is thrown-out of gear with the pinion b. In this position the jaw C can be freely moved up and down on the shank B. But if the sleeve is turned in the position shown in Fig. 3, the came throws the pawl in gear with the pinion b, and the movable jaw is firmly locked in position. The cam d c of the sleeve engages with a recess, g, in the shank of the pawl, so that when the pawl is thrown out of gear with the pinion b, the sleeve and the movable jaw will slide together up or down on the shank B. When `the pawl is thrown ont of gear with the pinion, therefore, the movable jaw can be readily adjusted according to the nut or other article to be acted upon, and by turning the sleeve in the proper direction the movable jaw is firmly locked in the desired position. The operation of adjusting the movable jaw, and of locking it in position, can be readily performed 4with one hand, and a-wrench is thus obtained, which is very convenient in its operation, which is not liable to get out of order, and which can be furnished at a comparatively low price.

What I claim as new, and desire to secure by Letters Patent, is-

The combination of a stop-pawl, E, a locking-sleeve, D, and a pinion, b, with the movable jaw, C, and with teeth c in the shank of the stationary jaw A of a wrench, substan- 'tially in the manner herein shown and described. y

B. G. MARTIN.

Witnesses:

W. HAUFF, E. F. KASTENHUBER.' 

